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P0446 TOYOTA

P0446 TOYOTA - EVAP System Vent Control Circuit

Repair Importance Level: 1/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Missing Fuel cap
  • Incorrect fuel filler cap used
  • Fuel filler cap remains open or fails to close
  • Foreign matter caught in fuel filler cap
  • Vent control valve harness is open or shorted
  • Vent control valve circuit poor electrical connection
  • Faulty vent control valve
  • Tech notes

    There are factory service bulletin for the following Toyota models:

    Toyota RAV4
    Toyota Tercel
    Toyota Paseo
    Toyota Camry
    Toyota Avalon
    Toyota Tacoma
    Toyota 4Runner
    Toyota T-100
    Toyota Factory Service Bulletin OBDII Code P0446

    2003 – 2004 Toyota Corolla
    2003 – 2005 Toyota Matrix
    Toyota Factory Service Bulletin OBDII Code P0446 Corolla and Matrix

    If P0446 is combine with P0440 and P0441 use this bulletin:
    2000-2003 Toyota Solara
    2000-2003 Toyota Avalon
    2000-2003 Toyota Camry
    2001-2003 Toyota Sienna
    Toyota Factory Service Bulletin OBDII Code P0446 Solara, Avalon, Camry, Sienna

    If only P0446 is present:
    2001-2003 Toyota Sienna
    Toyota Sienna Factory Service Bulletin OBDII Code P0446

    Toyota P0441, P0446 EVAP Diagnostics and Vacuum Switching Valve Testing Video




    User submitted video

    When is the code detected?

    The P0446 codes triggered when an improper voltage signal is sent to Engine Control Module (ECM) through EVAP canister vent control valve.

    Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible a noticeable fuel odor caused by the release of fuel vapors
  • P0446 Toyota Description

    The Evaporative System (EVAP) canister vent control valve is located on the EVAP canister and is used to seal the canister vent.

    This solenoid valve responds to signals from the Engine Control Module (ECM). When the ECM sends an ON signal, the coil in the solenoid valve is energized. A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components.

    This solenoid valve is used only for diagnosis, and usually remains opened.

    OBDII Code P0446 Toyota - EVAP System Vent Control Circuit - Autoodes.com

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    P0446 TOYOTA Comments

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    Repair Importance Level: 1
     
    1=Low 2=Medium 3=High  
    Repair Difficulty Level: 3
     
    1=Easy 2=Moderate 3=Hard  

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